Minutes later, Kelly was rolling a highlight reel of the times that Trump had said one thing about domestic or foreign policy only to change his opinion just days -- or sometimes one day -- later.

When Rubio accused Trump of scamming the American voters, and cited the controversial Trump University as an example, Kelly was quick to offer a well-prepared litigation recap of Trump U's history.

Kelly pointed out that Trump University had received a D-minus rating from the Better Business Bureau. When Trump argued that the grade was later elevated to an A, she pointed out that that wasn't true.